Отправка писем с сайта

$inConf = cmsConfig::getInstance();
$to_email       = $inDB->get_field('cms_users', 'id='.$user_id, 'email');
$postdate       = date('d/m/Y H:i:s');
$from_nick      = $inDB->get_field('cms_users', "id='{$author_id}'", 'nickname');
$profilelink    = HOST . cmsUser::getProfileURL($usrlogin);
$letter_path    = PATH.'/includes/letters/newwallpost.txt';
$letter         = file_get_contents($letter_path);
$letter= str_replace('{sitename}', $inConf->sitename, $letter);
$letter= str_replace('{profilelink}', $profilelink, $letter);
$letter= str_replace('{date}', $postdate, $letter);
$letter= str_replace('{from}', $from_nick, $letter);
$inCore->mailText($to_email, 'Новая запись на стене! - '.$inConf->sitename, $letter);